THE INFLUENCE OF WATER ON CONCRETE PROPERTIES
The article investigates the fundamentals involved, and a selection of physical and chemical properties of water in relation to concrete are examined. Experience suggests that most problems are related to water as a component of the concrete mix. The author suggests that superior water reduction by vacuum dewatering would have prevented many of the problems. Concrete is subject to water surplus due to the requirements of cement hydration. In practice there is a demand for high consistency which tends to be against high workability. Conventional laying techniques require timing judgements with crude criteria such as floating/workability, bleed cessation and first set. Water reduction by low slump strategies is not sufficient to make substantial improvements in void structure. Superplasticisers can create better combinations of consistency/workability, but cannot significantly improve the void structure. When vacuum dewatering systems are used, the ready mixed concrete can be supplied at high consistency, precompacted by vibration, then further compacted and rendered workable by positive removal of surplus water. (TRRL)
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/05490219
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Corporate Authors:
New Zealand Concrete Research Association
Private Bag
Porirua, New Zealand -
Authors:
- Tait, J
- Publication Date: 1990-8
Language
- English
Media Info
- Pagination: p. 27-32
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Serial:
- NEW ZEALAND CONCRETE CONSTRUCTION
- Volume: 34
- Publisher: CEMENT & CONCRETE ASSOCIATION OF NEW ZEALAND
- ISSN: 0549-0219
Subject/Index Terms
- TRT Terms: Concrete; Consistency; Dewatering; Mix design; Physical properties; Ready mixed concrete; Superplasticizers; Vacuum; Water; Workability
- Uncontrolled Terms: Concrete properties
- Old TRIS Terms: Vacuum dewatering
- ITRD Terms: 4755: Concrete; 4714: Mix design; 4723: Setting (concrete); 4355: Water
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00617432
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Files: ITRD, TRIS
- Created Date: Nov 30 1991 12:00AM